class Student:

    def __init__(self):
        self.name = "张三"
        print("调用构造函数")

    def run(self):
        print("打印构造方法里的初始化值："+self.name)


s1 = Student()
print(s1.name)
s1.run()
s2 = Student()
#print(s2.name)

